PUT Response status code 204 treated as error

[czoIg]

Hi!
After making PUT request, response status code is 204 (no content), which is valid response, but go-redmine treats it as error and tries decode content body which is empty string.
Here it is:

go-redmine/issue.go

Line 225 in b2dd060

if res.StatusCode != 200 {

In Redmine docs there are some pages that describes 204 code as confirmation that requested change was made:
https://www.redmine.org/projects/redmine/wiki/Rest_IssueCategories#PUT
https://www.redmine.org/projects/redmine/wiki/Rest_Memberships#PUT
https://www.redmine.org/projects/redmine/wiki/Rest_TimeEntries#Updating-a-time-entry
etc.

[mattn]

Okay, could you please send me pull-request like below?

res.StatusCode / 100 == 2

[czoIg]

Thanks for fast reply. PR is done: Ref #52